I am getting following error when trying to login on asp.net application.
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
In my web.config file, the connection string is like
<add name="DefaultConnection"
connectionString="Server=1.1.1.1; Database=XYZ; Uid=user; Pwd=pswd;"
providerName="System.Data.SqlClient" />
Web and database server are separated. There are other websites on same web server pointing to different database on same db server, work fine.
When I double click on user name in SQL Server 2008 R2 (Security -> Users -> user) I get the following error:
I have checked SQL Server service and they are running fine. Just wondering if there is anything to do with this user in SQL Server.
This error is not user related. Check to ensure remote connections are enabled on SQL Server via the SQL Server Configuration Manager utility and port 1433 is open on the firewall. You can test port connectivity using TELNET or with the Powershell command below.
1433 | % { echo ((new-object Net.Sockets.TcpClient).Connect("YourServerName",$_)) "server listening on TCP port $_" }
Named Pipes protocol (see error) is only for connection on same machine and this means (probably) that on SQL Server is not enabled tcp/ip protocol for external communication.
Another possible reason for the error is the named instance of sql server; on your connection string you put the ip address of the server without instance name (better to use the machine name and put the ip on DNS or in the hosts file), this means that your sql server don't have a named instance is correct ? For check the named instance see on services.
Other possible problems maybe:
The firewall (on client and on server),
The listening port of sql server.
The user that attempt to connect to sql server (wrong password, disabled, no permissions on db and/or on sql instance)
I had the same problem and for some reason I had to add the standard SQL port (1433) and then everything worked. In your case that would be:
<add name="DefaultConnection"
connectionString="Server=1.1.1.1,1433; Database=XYZ; Uid=user; Pwd=pswd;"
providerName="System.Data.SqlClient" />
Related
I am Trying to connect to my SQL Server but I keep getting this error:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (.Net SqlClient Data Provider)
This is my connection string
<connectionStrings>
<add name="myDB"
providerName="System.Data.SqlClient"
connectionString="Server=Usman-PC\SQLExpress; Database=myDB; Integrated Security=True;"/>
</connectionStrings>
I have google for solution and tried many things but keep getting this error.
I was developing accounts app and now it is time for deployment on production server. Please somebody help me.
Below are my settings
Computer name: Usman-PC
WorkGroup: USMAN-SERVER
Ip address: 192.168.0.1
Server Name: Usman-PC\SQLExpress
Instance Name: SQLEXPRESS
What I have tried:
I have looked at connection setting in Server Properties and they are good.
I also have checked and server is running.
I also have enabled TCP/IP and set the port to 1433.
I also have added new rule for port 1433 in firewall.
I am also able to transfer files between both computers.
I've built an .asmx web service which retrieves informations from a local sql server 2014 database.
Everything is working fine on localhost, but after publishing the web service to Azure i get the error:
An unhandled exception of type 'System.Web.Services.Protocols.SoapException'
occurred in System.Web.Services.dll
Additional information: Server was unable to process request. ---> A
network-related or instance-specific error occurred while
establishing a connection to SQL Server. The server was not found or
was not accessible. Verify that the instance name is correct and that
SQL Server is configured to allow remote connections. (provider: SQL
Network Interfaces, error: 26 - Error Locating Server/Instance
Specified)
SQL Server is configured to allow remote connections.
My connection string is like:
string con2 = #"Data Source=OfficePc\MSSQLSERVER2014;Initial Catalog=Database;Persist Security Info=True;User ID=Admin;Password=123456";
Is the error the result of something missing from the connection string, or am i missing some configurations changes?
As Paul mentioned in a comment under the question, your connection string is pointing to a local database resource (presumably on your dev machine). Even though you configured your local database server to support remote connections, the address OfficePc\MSSQLSERVER2014 isn't addressable, as that does not equate to a machine address (IP address).
Your app would need to connect to your database via an accessible IP address (which might require you to do some port-forwarding on your local network, or open ports on your firewall).
Alternatively, you can migrate your database to Azure (either with SQL Server in a VM or with the SQL Database service).
Keep in mind: If you are accessing a local (on-premises) database server from Azure, there will be latency added, as well as some outbound bandwidth costs.
It looks like SQL Server instance is not running or not accessible. Try connecting to the same database using SSMS and if you get the same error then the instance is not running.
Mostly the error occurs when the Database server was not found. Recheck if the server name (Data Source) is mentioned correctly. If you manually generated the connection string use .uld file to generate connection string.
To auto generate connection string using .udl file:
Create a sampe.txt file.
Rename it as sample.udl file.
Then double click on it, It will show you window entitled 'Data Link Properties'.
Configure the connection there.
Then Test the connection using test connection button.
Then open the file with notepad. It will show you the exact connection string.
For further reference check : MSDN
I need to access database in another computer using c#...I am using connection string with IP address for accessing database and also changed firewall setting but it shows error as follows
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or
was not accessible. Verify that the instance name is correct and that
SQL Server is configured to allow remote connections. (provider: TCP
Provider, error: 0 - A connection attempt failed because the connected
party did not properly respond after a period of time, or established
connection failed because connected host has failed to respond.)
I m using this connection string
SqlConnection con = new SqlConnection("data source=192.168.1.12,1063;initial catalog=trinity;integrated security=false;network library=DBMSSOCN");
This is actually quite a large topic involving: Networking, Authentication, Authorization and Permissions. Quick checklist:
Open port 1433 on local firewall where SQL Server is running.
Open SQL Server Configuration Manager on the local machine where SQL Server is running and enable TCP connections.
Add a Windows Login or SQL Account user and grant permissions to the database. DON'T USE THE SA ACCOUNT TO CONNECT REMOTELY EVER!.
In your connection string you have Integrated security=false;, so you need to provide User ID=mysqlserveruserid;Password=mysqlserverpassword; parameters in your connection string instead. If you change Integrated security=true; your Windows credentials will be used.
Also why the IP Address? Do you not have network name resolution on your network? e.g. DNS or WINS.
Is SQL Server running as the default instance or does it have a named instance? If it's a named instance (would have been a choice taken when installing SQL Server) You will need Data source=computername\sqlserverinstancename;
More detailed information on all these aspects can be found on MSDN
https://msdn.microsoft.com/en-us/library/ms345332.aspx
Try given solutions, it may help you
http://blogs.msdn.com/b/walzenbach/archive/2010/04/14/how-to-enable-remote-connections-in-sql-server-2008.aspx
I have a database called Library created in SQL Server 2014 under my locally created server instance. I am using that database as the datasource in my windows form application. It is working perfectly when on my computer, but when I run it on other machines, it stops with the error
Unhandled exception occurred...
A network-related or instance-specific error occurred while
establishing a connection to SQL Server. The server was not found or
was not accessible. Verify that the instance name is correct and that
SQL Server is configured to allow remote connections. (provider: Named
Pipes Provider, error: 40 - could not open connection to SQL Server)
I have started all services from configuration manager and have enabled tcp/ip under protocols for MSSQLSERVER. Is there any way I can accomplish this, or do I have to shift to local db?
Make sure that your connection string includes your remote machine name as part of the "Data Source", so something like :
connectionString="Data Source=machinename\SQLExpress;Initial Catalog=mydbname;Integrated Security=True"
note that this connection string will target a db name "mydbname", under the machine machinename which has a SQL Express instance.
if that didn't work let me see your connection string.
I've got an C# .Net 3.5 executable that runs on a local machine and makes database calls to a server running SQL Server 2005. I've added a System DSN using the Data Sources manager on the local machine called "localserver" (with the driver set to SQL Server). When I create the DSN, I can test the connection to the server successfully.
I've added localserver to my connection string in my executable, and I get an error "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)"
The server I am connecting to does allow for remote connections. When I replace localserver with the server name, it connects fine, but this program will be at multiple locations with multiple server names, so I need to make the data source dynamic.
Any ideas as to why this is happening?
Thank you,
Aaron
EDIT:
I've also tried using "localserver,1433" as my data source, but I get this error:
"A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: TCP Provider, error: 0 - No such host is known.)"
EDIT:
Thank you for your responses. To solve my problem, I made a small method to gather the servername using an odbc connection.
I can then send the servername to the SqlConnection. Thanks again for your input.
SqlClient (ie. SqlConnection) has absolutely nothing to do with ODBC. As such using an ODBC Data source Name in the SqlClient connection string will get you nowhere fast.
You can configure the server name in app.config and build the connection string using SqlConnectionStringBuilder. At deployment, you change the exe's or the user's .config file appropriately.
As Remus said, DSN has nothing to do with SqlConnection. Instead use this connection string:
http://www.connectionstrings.com/sql-server-2005#1
Also read this:
http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectionstring.aspx
An Excerpt from the above post:
To connect to a local computer,
specify "(local)" for the server. If a
server name is not specified, a
connection will be attempted to the
default instance on the local
computer.
I would repeat that SqlConnection has nothing to do with DSN,